The following table lists the Office versions that are supported for connecting to Microsoft 365 services. For example, connecting to Exchange Online, SharePoint Online, or OneDrive.
Office version
Supported for connecting until this date
Microsoft 365 Apps
Supported as long as you’re using a supported version.
Office LTSC 2021
October 13, 2026
Note
Support for connection to Microsoft 365 services with Office 2019 and Office 2016 ended on October 10, 2023.
As stated in a April 2017 blog post, only perpetual Office versions in mainstream support are supported for connecting to Microsoft 365 services. Office 2016 is now out of mainstream support, but its coverage was extended until October 2023, as stated in a September 2018 blog post.
Older Office versions not supported for connecting to Microsoft 365 services
Older Office versions might still be able to connect to Microsoft 365 services, but that connectivity isn't supported.
In practical terms, what this means is that older Office versions might not be able to use all the latest functionality and features of Microsoft 365 services. In addition, over time, these older versions might encounter other unexpected performance or reliability issues while using Microsoft 365 services. This situation occurs because improvements to Microsoft 365 services don't consider or test compatibility with these older Office versions.
No active measures are made to block older Office versions from connecting to Microsoft 365 services if they're in extended support and are kept up to date. For example, Office 2019 and Office 2016, both of which are in extended support until October 14, 2025.
Therefore, to provide the best experience with using Microsoft 365 services, we strongly recommend that you move off older Office versions to versions supported for connecting to Microsoft 365 services.
Upgrade resources available to administrators
We recommend that you upgrade older Office clients to a subscription version of the Office client, such as Microsoft 365 Apps for enterprise. The most up-to-date subscription versions of the Office client are always supported connecting to Microsoft 365 services.
We provide various services to help you upgrade to subscription versions of the Office client. The following list provides some examples of resources that are available:
Microsoft FastTrack, for migration and deployment assistance from Microsoft experts.
App Assure, for assistance from Microsoft with application compatibility issues.
Deployment guide for Microsoft 365 Apps, for technical documentation.
Product lifecycle dashboard and upgrade readiness dashboard, for users of Microsoft Configuration Manager (current branch).
Retirement of TLS 1.0 and 1.1
Since October 15, 2020, you must use at least TLS 1.2 to connect to Microsoft 365 services. For more information, see Disabling TLS 1.0 and 1.1 for Microsoft 365 and Preparing for TLS 1.2 in Office 365 and Office 365 GCC.
Basic authentication deprecation in Exchange Online
In early January 2023, Basic authentication for multiple protocols for Exchange Online was permanently turned off. For more information, see the following blog posts:
Basic Authentication Deprecation in Exchange Online – Time’s Up
Basic Authentication Deprecation in Exchange Online – What’s Next
Retirement of Skype for Business Online
Skype for Business Online was retired on July 31, 2021. For more information, see Skype for Business Online retirement.
Minimum version requirements for Outlook for Windows
As of November 1, 2021, there are minimum versions of Outlook for Windows required to connect to Microsoft 365 services, such as Exchange Online. For more information, see the following blog post: New minimum Outlook for Windows version requirements for Microsoft 365.
Note
The requirements only apply to Outlook for Windows. They don't apply to Outlook on other operating systems, such as macOS, iOS, or Android.
Additional information about connectivity to Microsoft 365 services
Connecting to Microsoft 365 services using Office 2016 for Mac isn’t supported. Office 2016 for Mac reached its end of support on October 13, 2020.
The following versions of Project are supported for connecting to Microsoft 365 services:
Project Online Desktop Client (as long as you’re using a supported version)
Project Professional 2021 and Project Standard 2021 (until October 2026)
Project Professional 2019 and Project Standard 2019 (until October 2023)
Project Professional 2016 and Project Standard 2016 (until October 2023)
The following versions of Visio are supported for connecting to Microsoft 365 services:
Visio desktop app that comes with a Visio Plan 2 subscription (as long as you’re using a supported version)
Visio LTSC Professional 2021 and Visio LTSC Standard 2021 (until October 2026)
Visio Professional 2019 and Visio Standard 2019 (until October 2023)
Visio Professional 2016 and Visio Standard 2016 (until October 2023)
This information about connecting to Microsoft 365 services doesn't apply to InfoPath 2013 or SharePoint Designer 2013.
Older Office versions might still be able to connect to Microsoft 365 services, but that connectivity isn't supported. In practical terms, what this means is that older Office versions might not be able to use all the latest functionality and features of Microsoft 365 services.
If you encountered a problem while installing Office on a PC, try restarting your computer and then attempting to install Office again. If that didn't help, use this easy fix tool to uninstall Office completely. After your uninstall is complete, try reinstalling Office.
Cloud-based access: Office 365 allows you to access your documents, emails, and other Office files from anywhere and on any device with an internet connection, including laptops, smartphones, and tablets. This allows you to work from anywhere, at any time, and on any device.
Office 2019 and Office 2016 will be supported for connecting to Microsoft 365 (and Office 365) services until October 2023. Examples of Microsoft 365 services include Exchange Online, SharePoint Online, and OneDrive for Business.
Office 2007, Office 2010, Office 365 or Office 2013 users can open documents created without any additional actions. If using an earlier version of Office, a compatibility pack may need to be installed.
Select Start > Settings > Apps > Apps & features. Apps & features in Settings.
Select the More icon next to the app you want to fix.
Select the Advanced options link under the name of the app (some apps don't have this option). On the page that opens, select Repair if it's available.
Right click on the Start button then select on Apps and Features. Locate the Office software in the list of apps, either listed as Microsoft Office 365 or Office 2019. Choose the Office app and select Modify. Select either option 1 of a Quick Repair or option 2 of an Online Repair, then select Repair.
Repair Office: You can try repairing your Office installation by going to Control Panel > Programs and Features > Microsoft Office > Change > Repair. This will repair any corrupted files and may resolve the issue. 2. Reinstall Office: If repairing Office doesn't work, you can try uninstalling and reinstalling Office.
If you want to stay up to date with the latest features and updates, Microsoft 365 is your best choice. Alternatively, if you prefer a trusted and stable interface with limited updates and enhancements, MS Office 2021 is for you.
In October 2022, Microsoft announced that it was to phase out the Microsoft Office brand in favor of "Microsoft 365" by January 2023, the name continuing to be used for legacy product offerings. However, Microsoft reversed this stance with the release of an Office 2024 preview build in November 2023.
Office 2021 is the standalone Microsoft Office suite of applications for Windows and Mac operating systems. You pay a single upfront fee for a lifetime* license. This license includes some apps you're probably already using like Microsoft Outlook, Word, PowerPoint, Excel, and Teams.
Fortunately, newer versions of Microsoft 365 have a nifty feature that allows you to check your documents for backwards compatibility with earlier versions of Word, Excel, and PowerPoint. To access this feature click File > Info. From there you'll see a button called Check for Issues.
You can only have one Version of Outlook running at a time. As has been said.. Office 365 Home Premium is a Virtualized app. You can actually run other versions of Office like 2010 at the same time just not both version of Outlook.
Can I install Office 365, and still keep Office 2007 installed? Yes; However, having multiple versions of Office installed, will likely confuse your client.
Introduction: My name is Nicola Considine CPA, I am a determined, witty, powerful, brainy, open, smiling, proud person who loves writing and wants to share my knowledge and understanding with you.
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