Microsoft did release an official MSN messenger for the N97 didn't they? They took their sweet-a** time but after several months they did. I don't think Microsoft has much problems with competing cellular devices, it's just really not a priority at all But now we are talking about an official competing OS. Microsoft's prime little baby is Windows, and i HIGHLY doubt they would develop apps for Apple OS or Linux. Is there an official Windows Live Messenger client for Debian or Ubuntu?
Also note that there are different releases of msn-pecan. If the one in extras doesn't work, try extras-testing, we need more votes to move that one to extras.
"It features "Multiple Points of Presence" (MPOP), the ability to sign in at 2 places at the same time with having chats replicated at all places."
thats how skype works. and thats how it should work if you just have a laptop/desktop and a mobile like the N900.
Skype just does that exactly, Google talk doesnt
Jabber/GTalk works just fine with "MPOP" (multiple resource ids), I often have at least N900 and either laptop or my home desktop on-line with Gtalk (in some cases even all 3) and initial contact goes to all of them and then depending on where I reply the conversation continues (I see no point of replicating the whole conversation in all of them).
The main problem with this is that if I forget my home machine on-line and I lose access on the N900 for a while (like in train, happens intermittedly) or put it offline for purpose I can miss convesation starters.