HyperV vhd file years older than .avhd snapshot

I inherited a Windows 2008R2  HyperV server that is hosting an Exchange server.  During a power outage that depleted the UPS, the system reported that the .avhd file was corrupt and couldn't be read when the Exchange VM was being started.  I restored from backup but was wondering why there is such a disparity between the original parent .VHD file and a number of .AVHD snapshots.  The original .VHD file is dated Feb 2011 and there are  four other .avhd files from various dates and then the most recent.  I thought these were supposed to merge upon VM shutdown but I have no idea how this machine has been powered down in the past.  Can a manual merge be performed and if so should it just be merged with the latest .AVHD file and the older ones deleted?  The parent VHD is 23gb and the latest avhd is 173gb.
Steve BantzIT ManagerAsked:
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The snapshots (depending on how they were taken) do not merge until you remove the snapshot.  At that time the VM then merges the snapshot back into the primary image.  What has happened (seen it too many times to count) is folks take a snapshot and use it as a backup, but what really occurs is that the original VHD file remains the same and any changes are written to the new image file.

What I would do is make sure you have a good backup of the vhd and the snapshot files and then revert each of them from oldest to newest in the Hyper-V Console.  Be aware that the system will be very slow or down for the time it takes to merge the files back.

Been down this path many, many times.  Good luck.

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