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We do! Historically (before FSLogix) we just used GPO to set the location of OSTs to a DFS share, and the same to control the amount of cached mail that lives in said OST.

What part of FSLogix is unstable for roaming the OST? Are you just using office containers?

I’d add that GPO and DFS isn’t without its stability issues. We do see duplicates and get deadlocks. FSLogix has been working relatively well where we deployed it, just keeping the agent updated can be a challenge

Using the profile feature not office. I get the ost is configured for a different mailbox. I might try the the office profile too. The fileshare is a good idea, might try that