SCCM backlogged inboxes

Joe Heaton 1 Reputation point

When running pre-req checks for MECM 2107, one of the warnings was that I have backlogged inboxes. Looking at my inboxes, I see one,, that has 400,000+ .otp files in it. Some of these date back to 2016 and more. Is it safe to just delete these?

Microsoft Configuration Manager
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  1. Amandayou-MSFT 11,056 Reputation points

    Hi @Joe Heaton ,

    These files may be related to retired out-of-band service points. According to my personal experience, we could delete it before backing it up in case of an accident. Besides, the warning of pre-req checks could be ignored as long as they do not affect the installation of SCCM.

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  2. Jason Sandys 31,191 Reputation points Microsoft Employee

    (+1) to @Amandayou-MSFT 's comments as this is certainly related to the OOB servicepoint which was removed in ConfigMgr 1511 so unless you are just upgrading from ConfigMgr 2012, these are certainly quite old and you can delete all of the items in the inbox. Even if you are upgrading from 2012, as noted, the role has been removed from the product anyway so these messages have zero value.

    My guess is that you upgraded from 2012 at some point but the clients were not upgraded right away (or perhaps you still have some 2012 clients) and they continued to send messages for this functionality until you upgraded them.

    Pretty much in all cases, they have zero value and can be deleted. I'm curious what the most recent date is though?

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  3. Joe Heaton 1 Reputation point

    Thanks for the replies. Most recent .otp file is dated 9/9/2018, so, yes, been around for a long time.

    I haven't gotten this backlogged inboxes warning before with pre-req checks, so is this something new for 2103/2107, or is there a possibility of another inbox gathering files? This was obviously the most egregious, but there were a few other folders that had multiple files in them.