Hi all, I'm running Arcserve 2000 on a windows 2000 server. My exchange server is exchange 2000 and it has the arcserve client installed as well as the exchange option. I'm having a problem with Arcserve failing on backing up mailboxes for users that were deleted. I get the error E8604 Failed to start backup ...... EC= Exch Exchange Agent (420) failed to open information store. I already solved one problem where I had this error for all of the mailboxes at the brick level. I caused the problem by hiding the exchange admin acct from the address list. Is my current problem because I have to wait for the tombstone on the mailboxes to expire? Anyone seen this before? Thanks Kim