Previously enterprise mobility channel boss at Motorola, Butt moved across to Avaya in 2008 in the midst of a transitional phase for the comms vendor, and in a little over three years with the firm transformed its channel-facing presence, as well as presiding over both the often rocky integration of the Nortel enterprise business and a memorable crusade against the grey market.
In a statement Avaya said his departure was part of the firm's "natural evolution" and was "not reflective of any gaps in personal or channel performance."
"Jeremy is ready to take on a new challenge outside of Avaya and we wish him the very best in his endeavours," a spokesperson said.
Avaya said its GTM (Go To Market) programme, launched in 2009, had now "matured into a vital organisation that is a driver in the overall transformation of Avaya," and stressed that its focus remained on the strategy set out by Butt.
However, it said, it would not look to fill Butt's role with a like-for-like replacement, instead expanding the remit of SVP and president of GTM, Tom Mitchell, to manage the channel going forward.
It is understood theatre channel bosses at Avaya will now report directly to Mitchell, effectively putting the channel one layer of command closer to CEO Kevin Kennedy.
However, Butt's departure is the latest in a string of high-profile executives to have left the firm, both in the UK and abroad. Last autumn the firm bid farewell to UK managing director Lee Shorten, and so far in 2012 has already lost UK channel boss Niall Anderson.