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Few times a day every day I get something hitting my site on urls like this:

/MSOffice/cltreq.asp?UL=1&ACT=4&BUILD=6551&STRMVER=4&CAPREQ=0 /_vti_bin/owssvr.dll?UL=1&ACT=4&BUILD=6551&STRMVER=4&CAPREQ=0

The user agent is this: UserAgent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)

Looks like some sort of Microsoft bot? What its trying to do.

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up vote 6 down vote accepted

This is related to the Web Discussions Toolbar that comes with Office 2003 which is an add-in to Internet Explorer. IE is querying your site to see if it supports the extensions required to support this.

The only thing you can do to mitigate the problem is create /MSOffice/cltreq.asp as a zero length file on your server as this will be quicker to serve than a 404 page.

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You beat me by a minute +1 – divitiae Oct 1 '09 at 10:43

It's not a bot.

Your users have Microsoft Office installed, and the discussion bar turned on in IE. IE is querying the server to see whether it supports web discussions.

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These requests are generated when someone browses your site with Internet Explorer's Discussion toolbar enabled. You can safely ignore these requests.

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