I've run into this issue with one customer for a long time. There's also some general performance limitations with cached mode (> 500 folders in entire mailbox, > 100k items in a single folder) that could come into play. If you turn off cached mode for the additional mailboxes, then you don't have this issue. If there are a lot of folders, you can hit the limit very quickly and the mailbox will stop updating. When in cached mode, Outlook opens 1 connection for every folder in the additional mailboxes. ![]() ![]() ![]() Since you can't control these server limits in O365 (but you can if this was on-prem), you're going to need to implement a workaround. There is an issue with cached mode when using secondary mailboxes in Outlook (shared or regular user mailboxes) that's related to maximum limits defined on the server.
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