iPhone atlas has some information for you Exchange and Lotus server admins. Sybas iAnywhere coming 1qt 2008, details below.

Sybase iAnywhere: Exchange, Lotus Domino in native iPhone email client: ”
‘The Information Anywhere suite connects mobile clients to email systems using standards, but not IMAP, which many email administrators shun do to potential unfettered exposure of email traffic to the Internet. Those using the Sybase solution for making the iPhone a corporate email client will be able to use their mobile networks to securely synchronize and replicate their emails […] The Sybase approach will work with any iPhone and supports all Domino versions from R6 through the new version 8, as well as Exchange 2000 through Exchange 2007.’

Sybase says iAnwyhere for the iPhone will be available in the first half of 2008 and has set up a notification form for interested users.”

(Via iPhone Atlas.)