I will take a shot here...
The 7100 ( or any other blackberry) will sync swith Lotus. You should check RIM's site for preceise version specs.
Memos and to-dos are normally synced with RIM's Desktop Manager software via your PIM application. See # 3
#3 No. Palm Desktop is history. Your BB will come with DEsktop Manager to sync with a PC. You will also need a program we sell http://store.bizshopr.com/pmblackberry.html
to sync your BB on the Mac.