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Try upgrading your discrete/onboard graphics and mother board drivers.<br />
<br />
If Lenovo website don't list latest drivers for windows 8. Try downloading from Microsoft/Manufacturers website.<br />
<br />
You can use cpu-z/gpu-z to find out motherboard/graphics card specs.<br />
<br />
<a href="http://www.cpuid.com/softwares/cpu-z.html" rel="ugc">http://www.cpuid.com/softwares/cpu-z.html</a><br />
<a href="http://www.techpowerup.com/gpuz/" rel="ugc">http://www.techpowerup.com/gpuz/</a><br />
<br />
And which version of MS Outlook is your system running.
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Try upgrading your discrete/onboard graphics and mother board drivers.

If Lenovo website don't list latest drivers for windows 8. Try downloading from Microsoft/Manufacturers website.

You can use cpu-z/gpu-z to find out motherboard/graphics card specs.

http://www.cpuid.com/softwares/cpu-z.html [http://www.cpuid.com/softwares/cpu-z.html]
http://www.techpowerup.com/gpuz/ [http://www.techpowerup.com/gpuz/]

And which version of MS Outlook is your system running.

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Hello all,<br />
<br />
we have win 8 PRO with process called desktop windows manager on Lenovo Laptop with high CPU usage, this case to our laptop to freeze from time to time, specially when using outlook shared calendar. &nbsp;<br />
<br />
please advice.
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Hello all,

we have win 8 PRO with process called desktop windows manager on Lenovo Laptop with high CPU usage, this case to our laptop to freeze from time to time, specially when using outlook shared calendar.  

please advice.

desktop windows manager CPU Usage

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems, with an emphasis on improving its user experience on tablets. In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen, a new platform for developing apps with an emphasis on touchscreen input, integration with online services, support for USB 3.0, Advanced Format hard drives, near field communications, and cloud computing. Additional security features were introduced, such as built-in antivirus software, integration with Microsoft SmartScreen phishing filtering service and support for UEFI Secure Boot on supported devices with UEFI firmware.