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refresh_pattern for windowsupdate

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Hi

I am using squid 2.5-10 stable as transparent cache.
I have just started using refresh_pattern value to save more Bandwidth. 
I noticed my users are doing lot of windows update and antivirus update.
My cache_mem value was 8 mb earlier which I increased to 32mb today.
I made below configuration 

refresh_pattern -i exe$ 0 50% 999999
refresh_pattern -i zip$ 0 50% 999999
refresh_pattern -i tar\.gz$ 0 50% 999999
refresh_pattern -i tgz$ 0 50% 999999
refresh_pattern http://.*\.windowsupdate\.microsoft\.com/ 0 80% 20160
reload-into-ims
refresh_pattern http://office\.microsoft\.com/            0 80% 20160
reload-into-ims
refresh_pattern http://windowsupdate\.microsoft\.com/     0 80% 20160
reload-into-ims
refresh_pattern http://w?xpsp[0-9]\.microsoft\.com/       0 80% 20160
reload-into-ims
refresh_pattern http://w2ksp[0-9]\.microsoft\.com/        0 80% 20160
reload-into-ims
refresh_pattern http://download\.microsoft\.com/          0 80% 20160
reload-into-ims
refresh_pattern http://download\.macromedia\.com/         0 80% 20160
reload-into-ims
refresh_pattern ftp://ftp\.nai\.com/                      0 80% 20160
reload-into-ims
refresh_pattern http://ftp\.software\.ibm\.com/           0 80% 20160
reload-into-ims
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern .               0       20%     4320


Below is my access.log . I am still getting TCP_MISS

1124761891.740    273 10.18.1.227 TCP_MISS/206 15555 GET
http://au.download.wind
owsupdate.com/msdownload/update/v5/psf/windowsxp-sp2-x86fre-usa-2180_056
b2b38baf
5620be85ddd58141b073bc0b06a1d.psf - DIRECT/64.4.20.62
application/octet-stream
1124761892.107     19 10.18.13.98 TCP_IMS_HIT/304 206 GET
http://windowsmedia.co
m/Mediabar/static/mediabar.css - NONE/- text/css
1124761892.152    266 10.18.25.70 TCP_MISS/206 9682 GET
http://au.download.windo
wsupdate.com/msdownload/update/v3-19990518/cabpool/outlfltr_01bcc7d2d28a
d160ed23
c0a43be5db1d2bda227b.cab - DIRECT/64.4.20.62 application/octet-stream
1124761892.877     30 10.18.13.98 TCP_IMS_HIT/304 222 GET
http://windowsmedia.co
m/mediabar/Static/Common.js - NONE/- application/x-javascript
1124761893.634    263 10.18.1.227 TCP_MISS/206 15561 GET
http://au.download.wind
owsupdate.com/msdownload/update/v5/psf/windowsxp-sp2-x86fre-usa-2180_056
b2b38baf
5620be85ddd58141b073bc0b06a1d.psf - DIRECT/64.4.20.62
application/octet-stream

Is there any configuration problem??

Thanks - LK 
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