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サポート期限がきれていた
7.2RELEASE のシステムを7.3RELEASEにfreebsd-updateを使用して更新した
アップグレード開始
#freebsd-update -r 7.3-RELEASE upgrade
/etc/mail/mailer.confがコンフリクトしているとのことで修正した
あといくつか更新の確認があった
カーネルの更新
#freebsd-update -r 7.3-RELEASE install
リブートしてユーザーランの更新
#freebsd-update install
終了後リブートして完了した

参考
FreeBSD 7.2-RELEASEのサポート期限到来

FreeBSD 8.1-RELEASE Announcement
FreeBSD 8.1-RELEASE Release Notes
いくつかの新しくなった点
　*zfsloader added
　*zpool version of ZFS subsystem updated to version 14
　*NFSv4 ACL support in UFS and ZFS; support added to cp(1), find(1), getfacl(1), mv(1), and setfacl(1) utilities
　*UltraSPARC IV/IV+, SPARC64 V support
　*SMP support in PowerPC G5
　*BIND 9.6.2-P2
　*sendmail updated to 8.14.4
　*OpenSSH updated to 5.4p1
　*GNOME 2.30.1, KDE 4.4.5

SAが出ていました
http://security.freebsd.org/advisories/FreeBSD-SA-10:07.mbuf.asc
FreeBSD 7.2-RELEASEのパッチはなし

FreeBSD Security Information
FreeBSD 7.2-RELEASEのサポート期限になったそうです

+--------------------------------------------------------------------+
|  Branch   |  Release  |  Type  |  Release date   |  Estimated EoL  |
|-----------+-----------+--------+-----------------+-----------------|
|RELENG_6   |n/a        |n/a     |n/a              |November 30, 2010|
|-----------+-----------+--------+-----------------+-----------------|
|RELENG_6_4 |6.4-RELEASE|Extended|November 28, 2008|November 30, 2010|
|-----------+-----------+--------+-----------------+-----------------|
|RELENG_7   |n/a        |n/a     |n/a              |last release + 2y|
|-----------+-----------+--------+-----------------+-----------------|
|RELENG_7_1 |7.1-RELEASE|Extended|January 4, 2009  |January 31, 2011 |
+-----------+-----------+--------+-----------------+-----------------|
|RELENG_7_3 |7.3-RELEASE|Extended|March 23, 2010   |March 31, 2012   |
|-----------+-----------+--------+-----------------+-----------------|
|RELENG_8   |n/a        |n/a     |n/a              |last release + 2y|
|-----------+-----------+--------+-----------------+-----------------|
|RELENG_8_0 |8.0-RELEASE|Normal  |November 25, 2009|November 30, 2010|
|-----------+-----------+--------+-----------------+-----------------|
|RELENG_8_1 |8.1-RELEASE|Extended|not yet          |release + 2 years|
+--------------------------------------------------------------------+