I thought IM+ works with now on 4.0 on Bell Mobility, but I got this message from their support :
Sorry, but if you don't have BES/MDS Hosting you can't use Regular
version of IM+. You should get BES/MDS Hosting in order to make IM+ and other 3rd party
Internet applications work. The most popular services are MailStreet, eOutlook, Lanlogic,
MyBlueberry, MobileWeb4U. The service will cost you from $10 to $25 extra per month
in order to gain access to the Internet and TCP/IP software.
So you can try to use WAP version configuring all demanded settings as