When running a user migration session in intra-forest scenario, the "Reconnect Exchange mailbox" check box is grayed out.
Please verify the following:
1. The source and target domains belong to the same forest.
2. You are seeing only Migration node under your domain pair and there is no Synchronization node.
3. There is an Exchange server in organization and forestprep and domainprep (Target) schema extensions were performed. This can be verified by going into the Properties for the domain pair, Object MAtching Tab - Attributes to skip button. If there is no Exchange in the forest, then by default the adminDescription and adminDisplayName attributes are used to store auxiliary information for all object classes. In the scenario where Migration Manager can see Exchange organization, Custom Attributes 14 and 15 will be used.
If all of the above is verified please do the following:
Create second domain pair Target-Source and see if option "Reconnect Exchange mailbox" becomes available. If this is the case please delete and recreate your original Source-Target domain pair. Most likely it was created before Domainprep (Forestprep) was run and Migration Manager were not aware about the presence of Exchange in the domain (forest).
CAUTION: Deleting domain pair will also delete all previous migration sessions and rollback will not be possible.
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