*Update added on 11/4/2021
**Update added on 1/12/2022
***Update added on 3/1/2022
****Update added on 3/23/2022
We are quickly approaching the November 1st deadline when the minimum version requirements for connecting Outlook for Windows to Office 365/Microsoft 365 services will change. So, we thought we’d share more information on why we’re doing that.
After November 1, 2021, only Outlook 2013 Service Pack 1 (with latest fixes) and later will be able to connect to Microsoft 365 services. It’s worth noting here that Outlook 2007, 2010, and Office 2013 versions earlier than 15.0.4971.1000 *and Office 2016 versions earlier than 16.0.4600.1000 aren’t supported now, but we know some customers just can’t quit them.
Since our Message Center post last fall, we’ve seen a drop in the usage of the unsupported versions of Outlook for Windows – great job! If you’re still running older versions, please start working on a plan to move by November 1st.
Our Customer Support team is actively reaching out to tenants that have the most usage on Outlook 2007 and 2010 to help them meet the deadline. If you have questions or concerns about getting all users off these unsupported builds, please reach out to your support teams.
*As announced, the block will start rolling out on November 1st for users on Outlook 2007 and will proceed in a phased rollout.
**The block has started rolling out for Outlook 2010 users on January 11, 2022 and will proceed in a phased rollout.
***The block has started rolling out for Outlook 2013 users (on versions earlier than 15.0.4971.1000) on February 28, 2022 and will proceed in a phased rollout.
****The block will start rolling out for Outlook 2016 MSI users (on versions earlier than 16.0.4600.1000) & Outlook for Microsoft 365 users (on versions earlier than 16.0.8321.1000) on March 28, 2022 and will proceed in a phased rollout.
Outlook users will see the following error message in Outlook, when they experience the block that we are rolling out: “Your Microsoft Exchange administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance.”
Please note that once Outlook 2007 or Outlook 2010 is blocked from connecting to Exchange Online, we are unable to restore the ability to connect. Users can immediately start using Outlook on the web through a browser on their Windows (or any other) device. Outlook on the web connects to Exchange Online and allows the user to interact with their email, contacts, calendar, groups, public folders and tasks.
In order to connect to Exchange Online using Outlook for Windows, the device must be upgraded to a supported version of Outlook for Windows as outlined below.
Customers can also immediately obtain a free 1-month trial of Microsoft 365 Apps for business, which includes the Outlook desktop client to use with their existing Exchange Online subscription.
***Outlook 2013 users should see the following error when attempting to connect to a mailbox in Exchange Online using an out of support build of Outlook 2013 after the block is enabled:
****Outlook 2016 users should see the following error when attempting to connect to a mailbox in Exchange Online using an out of support build of Outlook 2016 after the block is enabled:
Older versions of Outlook, such as Outlook 2007 and 2010 are incompatible with the following upcoming service changes, which is prompting this controlled block:
It can be a challenge to stay current, but there are many reasons why staying current is a good idea:
For tenant admins who would like to know what versions of Outlook are active in their tenant, the Email apps usage report provides a full list of all users and Outlook versions in use within a tenant organization. For more information, see Microsoft 365 Reports in the admin center - Email apps usage.
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