"These services are quite similar," Williams writes. "Xobni has the longest track record. it started as a consumer-based service, gaining a following for its search capabilities in Outlook."
"Search is Outlook's inherent weakness," Williams notes. "Neither DocVerse nor Harmony have deep search capabilities like Xobni. That may only be a temporary issue for DocVerse. Last week, Google announced that it had acquired DocVerse. We expect that will in some way translate into better search in the weeks and months ahead for the DocVerse service."
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