Off the top of my head, this is usually caused by your company not using the Advanced Outlook Synchronisation (in Administrator; Tools, Options, Outlook Synchronisation) and/or your PC not having the Outlook sync client installed on the machine.
Your company may be using Exchange Link which links your Oulook and SalesLogix calenders from your Exchange server rather than having to install the Outlook sync client on each machine, in which case you won't need to use the Outlook Sync tab anyway.
FYI: Exchange Link is a great tool and saves loads of time and effort (not to mention upgrade and other agro) by centralising the management of the Outlook-SLX integration. There are reasons not to use it, but I would suggest checking with your BP and finding out if you can/should have this.
I hope this helps.
Ben