(312の続き)
再度 www.microsoft.com にtraceroute(winだからtracert)掛けてみたら

Tracing route to lb1.www.ms.akadns.net [207.46.198.30]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.168.0.1
2 10 ms 10 ms 10 ms goat.chiba-ip.dti.ne.jp [203.181.70.55]
3 11 ms 10 ms 10 ms ip-gate.chiba-ip.dti.ad.jp [203.181.70.49]
4 12 ms 11 ms 12 ms chiba-ip-gate-1.otemachi4.dti.ad.jp [202.216.252.170]
5 13 ms 12 ms 13 ms core1-1.otemachi4.dti.ad.jp [202.216.251.1]
6 12 ms 13 ms 13 ms core5-2.otemachi.dti.ad.jp [202.216.227.211]
7 12 ms 13 ms 13 ms 210.188.136.249.customerlink.pwd.ne.jp [210.188.136.249]
8 15 ms 13 ms 13 ms 61.204.214.79.bb.t.pwd.ne.jp [61.204.214.79]
9 13 ms 13 ms 14 ms 61.204.213.79.bb.t.pwd.ne.jp [61.204.213.79]
10 12 ms 12 ms 12 ms 61.215.17.238.bb.t.pwd.ne.jp [61.215.17.238]
11 112 ms 112 ms 112 ms 211.10.247.202.bb.t.pwd.ne.jp [211.10.247.202]
12 114 ms 112 ms 112 ms edge1.pao1.us.msn.net [198.32.176.152]
13 113 ms 113 ms 113 ms 207.46.41.129
14 132 ms 132 ms 134 ms pos6-2.tuk-76cb-1a.ntwk.msn.net [207.46.34.173]
15 131 ms 131 ms 131 ms pos1-0.iuskixcpxc1202.ntwk.msn.net [207.46.36.146]
16 131 ms 131 ms 131 ms pos1-0.tke-12ix-1b.ntwk.msn.net [207.46.155.5]
17 133 ms 131 ms 132 ms po10.tuk-65ns-mcs-1a.ntwk.msn.net [207.46.224.151]
18 * * * Request timed out.
(30までRequest timed out.)

Trace complete.

うーん、なんか*.msn.net内の問題みたいですね。
それにしても、
> 10 12 ms 12 ms 12 ms 61.215.17.238.bb.t.pwd.ne.jp [61.215.17.238]
> 11 112 ms 112 ms 112 ms 211.10.247.202.bb.t.pwd.ne.jp [211.10.247.202]
11 の所の遅延が…。