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I deal with OST file issues constantly, but not sure that they are normally corruption based. The vast majority are caused by Citrix UPM Read-Only containers and getting different versions of the OST Files (basically) so the user gets "You are using an old copy of the OST" and can't log in.

How often does that occur for your users? We have that FSLogix feature to delete old OSTs turned on. Wish there was an easy way to track down what’s causing it.

We deal with probably about 5 - 10 users per week.