This has bugged me, a bit, for the past week or so. Whenever I start the IBM Notes 9.0.1 client ( I'm running it on Mac OS X 10.10 ), I found that my Contacts ( address book aka names.nsf ) would always appear as an open tab: -
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I tried ( almost ) everything to resolve this, including multiple restarts of the client, checking/unchecking this: -
I even jumped into Notes Basic ( via /Applications/IBM\ Notes.app/Contents/MacOS/Notes -basic ) but to no avail.
Eventually, I found this: -
and a Google search led me to this: -
Once I removed the entry for Contacts: -
all was well.