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We have a "standard" infrastructure and i have 2 CAS server and 2 mailoxes servers inside our principal site.
Those 2 mb servers are mounted with a DAG .

We have another external site to replicate it and that is suppose to be synchronised with our first site.

Last weekend, the mailbox server changed of mailboxes databases...(by itself)

Is there some of you with a similar setup ??
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This could happen if Exchange detects server hosts databases is offline or secondary server has better bandwidth or response than server is hosting databases.
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Simon Butler (Sembee)2014-11-19 03:44 AMID: 134606
This is a common configuration.
The main reasons I see for inter-site failover is lack of AD Sites and Services configuration and DAC mode not being enabled.